Can stacker



FIG. 1 is a top perspective view of a can stacker embodying my new design,

FIG. 2 is a side elevation view,

FIG. 3 is a side elevational view with the can stacker slightly rotated in a counterclockwise direction,

FIG. 4 is a top plan view as oriented in FIG. 2, and

FIG. 5 is a bottom plan view as oriented in FIG. 3. 

The ornamental design for a can stacker, as shown. 